Highly E-selective solvent-free Horner–Wadsworth–Emmons reaction catalyzed by DBU
作者:Kaori Ando、Kyohei Yamada
DOI:10.1039/c1gc15134g
日期:——
The solvent-free Horner–Wadsworth–Emmons reaction of triethylphosphonoacetate with a variety of aldehydes was catalyzed by DBU in the presence of K2CO3 to give E-α,β-unsaturated esters highly selectively (99:1 for most of the reactions). The reaction with ketones gave trisubstituted olefins with good to high E-selectivity by DBU-Cs2CO3.
这 溶剂无Horner–Wadsworth–Emmons的反应 膦酸三乙酯 与各种 醛类DBU在K 2 CO 3的存在下催化得到E -α,β-不饱和酯类高度选择性(大多数反应为99 :1)。与之反应酮类 给出三取代 烯烃DBU-Cs 2 CO 3具有良好的电子选择性,甚至具有很高的电子选择性。
Hydrazide and alkoxyamide angiogenesis inhibitors
申请人:——
公开号:US20020002152A1
公开(公告)日:2002-01-03
Compounds having the formula
1
are methionine aminopeptidase type 2 (MetAP2) inhibitors and are useful for inhibiting angiogenesis. Also disclosed are MetAP2-inhibiting compositions and methods of inhibiting angiogenesis in a mammal.
Highly Selective Synthesis of <i>Z</i>-Unsaturated Esters by Using New Horner−Emmons Reagents, Ethyl (Diarylphosphono)acetates
作者:Kaori Ando
DOI:10.1021/jo970057c
日期:1997.4.1
New Horner-Emmons reagents, ethyl (diarylphosphono)acetates 1, were prepared from triethyl phosphonoacetate, PCl(5), and the corresponding phenols. The reaction of 1 with several kinds of aldehydes in the presence of Triton B or NaH in THF solvent revealed that these reagents are useful for the synthesis of Z-unsaturated esters. Among the reagents examined, ethyl(di-o-tolylphosphono)-, [bis(o-ethylphenyl)phosphono]-
New polymer-supported phosphonate reagents for the synthesis of Z-α,β-unsaturated esters
作者:Kaori Ando、Yusaku Suzuki
DOI:10.1016/j.tetlet.2010.02.113
日期:2010.4
Newpolymer-supported phosphonate reagents have been prepared and evaluated for the synthesis of Z-α,β-unsaturated esters. High Z-selectivity was obtained using the reagent having two o-t-BuC6H4 groups.
Iridium complex-catalyzed carbonylation of allylic phosphates
作者:Ryo Takeuchi、Yasushi Akiyama
DOI:10.1016/s0022-328x(02)01370-0
日期:2002.5
[Ir(cod)Cl]2 with a ligand such as P(2-furyl)3, PPh2C6F5 or AsPh3 showed high catalytic activity for the carbonylation of allylic phosphates in the presence of alcohols to give the corresponding β,γ-unsaturatedesters. The carbonylation of diethyl (E)-3-phenyl-2-propenyl phosphate in the presence of EtOH under an initial carbon monoxide pressure of 40 kg cm−2 at 100 °C gave ethyl (E)-4-phenyl-3-butenoate
具有配体如P(2-呋喃基)3,PPh 2 C 6 F 5或AsPh 3的[Ir(cod)Cl] 2在醇存在下显示出对烯丙基磷酸羰基化的高催化活性,得到相应的β ,γ-不饱和酯。(E)-3-苯基-2-丙烯基磷酸二乙酯在EtOH存在下于100 kgC的初始一氧化碳压力为40 kg cm -2的羰基化反应得到(E)-4-苯基-3-丁烯酸乙酯收率达90%。否(Z获得)-异构体。不使用胺作为添加剂,反应进行顺利。在EtOH存在下磷酸2-链烯基二乙酯的羰基化反应得到(E)-和(Z)-3-链烯酸乙酯的混合物。起始原料的立体化学通过丢失顺-反插入一氧化碳的进iridiumcarbon键之前中间到π烯丙基铱的异构化。增加烯丙基系统在γ位上的取代基的空间体积,或增加初始一氧化碳压力,将增加对具有与起始原料相同的立体化学的产物的选择性。